Improvement in carpenters  gages



G. MILLER.

Carpenters Gage.

Patented Oct. 17, 1865.

W/T/VA'SSA'J M m) i lwLllhngr-xphon Washmqlo UNITED STATES PATENTOFFicE.

IMPROVEMENT IN CARPENTERS GAGES.

Specification forming part of Letters Patent No. 50,484, dated October17,1865.

To all whom it may concern.-

Be it known that I, GEORGE MILLER, of the city and county of\Vashington, in the District of Columbia, have invented a new and usefulImprovement in Combination-Gages; and I do hereby declare that thefollowing is a full, clear, and exact description thereof, referencebeinghad to the annexed drawings, and to the letters of reference markedthereon, in which- Figure 1 is the face side. Fig. 2 is an edge view.Fig. 3 is the bevel side, and Fig. 4 is an end view.

The same letters indicate corresponding parts in the several figures.

The nature of my invention consists in an improvement upon theinstrument patented to me on the 17th of January, 1865, whereby, bymeans of certain additions to and modifica: tions ofsaid instrument, Iam not only enabled to gage and scribe irregular surfaces, as with thatinstrument, but also to apply it in use as a panel-gage, as a square, asa bevel, or as a trammel or dividers.

To enable others skilled in the art to make and use my invention, I willproceed to describe its construction and operation, as follows:

I construct my combinationgage of steel, brass, iron, or other materialsuited to the purpose, except the stock thereof, for which I prefersubstantial solid wood, such as ebony, rose-wood, or mahogany.

A in Figs. 1, 2, 3, and at is the stock, usually about nine inches long,two and onefourth inches wide, and five-eighths of an inch thick, itsunder side having at each edge a square rabbet equal to half thethickness of the stock. 0n the upper side two channels, aboutone-sixteenth of an inch deep, are countersunk transversely near thecenter, leaving about seven-eighths of an inch space between them. Intoeach of these channels is let an end of one of the two blades B B, whichends are secured by a boss, D, riveted through the blades B B and thestock A. These blades are each about ten inches long and one inch broad,about one-sixteenth of an inch thick for two-thirds their width on theouter side, and on the inner third of their width raised to about threetimes that thickness. On the thick or inner edge of each blade a squaregroove, a little more than one-third of this thickness, runs from end toend. A slide, 1, of uniform thickness and widththat is to say, made ofNo. 16 steel, and one inch widefits inthis groove, being twenty inches,more or less, in

vlength. Half an inch from the other end of this slide 0 begins a slot,0, one-fourth of an' inch wide and four and one-half inches long. Intothis slot enter the rabbeted washers, their shoulders resting on thesurface, (as seen in Fig. 2.) The upper washer, H, is about one inchlong, three-eighths of an inch wide, and three-sixteenths of an inchthick. The under washer, H, is of like length and width, andthree-eighths of an inch thick. The upper washerhas two holes of equalsize, as the under washer has also; but in one of the latter ascrew-thread is formed to receive and retain a hollow burr-headed screw,6, having a shoulder to clamp and hold the two washers firmly to theirplace. Through this screw passes a small steel rod, 9, pointed for agage-tooth on its under end, and held in position or adjusted by a smallset-screw, f. Through the other holes passes a pencil, p, for markinguneven surfaces when the gage-tooth is removed. On the under side ofthis end of the slide (3 is a small boss riveted thereto to form the nutfor the adjustable point E, which point is made of three-sixteenthssteel wire, having a thread on one end to correspond with the threadwithin the boss I. This pointis three and onehalf inches long. When notused as a scribing-gage it fits into a pocket, It, in one end of stockA, within which pocket is aspring to retain it. (This pocket is shown bydotted lines in Figs. 1 and-3.)

Screw 6, Fig. 1, is hollow and burr-headed, having a set-screw,f, in itsside, and having at its lower end athrea-d five-eighths of an inch long,(as seen in Fig. 2,) forming a shoulder on the body of the screw. Thisscrew 0 acts as a set-screw to hold slide 0 in position when used as apanel-gage, and also to hold said slide 0, Fig. 3, when used as a bevel.Thenut m on the under side of stock A, in the center thereof, Fig. 4,receives screw 0 when the instrument is used as a bevel. g and g, asshown in Fig. 2, are steel points, held in the hollow screws 0 and e forstriking circles and segments. L, as seen in Figs. 3 and 4, is a Washerfixed at one end to the under or gage side of the stock, and having ahole at the other end coincident with the central hole in the stock, topass over blade 0 and receive the pressure of screw 0, and thus retainblade 0 in its position at any desired angle.

This instrument may be applied to its various uses as followsz' To usethe machine as a gage, the point N is adjusted on the blate O to therequired distance from the stock A, or the pencil 19 may be used to makea scribe-mark. When used as a square the stock A and blades B afford thenecessary rectangular surfaces, and by shifting the blade 0 to the otherside of the stock and clamping it, as shown in Fig. 3, the tool isadjusted as a bevel; as a trammel or dividers, the points 9 g are used,the latter GEORGE MILLER.

Witnesses FRANK SMITH, C. M. SWANY.

